How long is the extension of the blue ridge mountain range that Nichol's Gap Road was built over?
70 mi
-1
Section::::Abstract.
Nichol's Gap Road
33966147
-1
Section::::Abstract.
Nichol's Gap Road
33966147
-1
Section::::Abstract.
South Mountain (Maryland and Pennsylvania)
6689608
-1
Section::::Abstract.
South Mountain (Maryland and Pennsylvania)
6689608